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AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread] Watch

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    Just to verify... when the force on the wire is downwards due to flemings left hand rule then would the scale reading decrease because of a reaction force and vice versa if the force is upwards? If so what would the reaction force be?

    Thanks for any help

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    (Original post by Klaxoii)
    And this question, Attachment 423969


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    Here's my solution:
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    Hi. Where do you find that file?
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    Six marker predictions??
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    (Original post by gcsestuff)
    Can anyone help?

    Attachment 424073


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    Since it's at the midpoint the field strengths from the masses are the same but in opposite directions so the resultant field strength is 0 at the midpoint. For the potential, use V=-\frac{GM}{R} to get that the potential due to each mass is -\frac{Gm}{r/2}=-\frac{2Gm}{r}, so total potential is -\frac{4Gm}{r} (potential is scalar so it's simple algebraic addition).

    Answer: C
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    (Original post by xela238)
    Six marker predictions??
    Lol you've already asked this, and to be fair, I don't think it can be predicted because the examiners aren't that stupid.
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    (Original post by MsFahima)
    Hi. Where do you find that file?
    Examiner's report
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    (Original post by xela238)
    Six marker predictions??
    It won't be something we could predict


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    (Original post by NEWT0N)
    Examiner's report
    That's it


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    (Original post by NEWT0N)
    Examiner's report
    Thank youu!
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    (Original post by MsFahima)
    Thank youu!
    No worries
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    (Original post by xela238)
    Six marker predictions??
    We will deffo have questions on Capacitors and SHM because our EMPA's were about that. But I really hope the six marker isn't capacitors. I have them!
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    This is going to sound completely crazy but I think I've decided that my strategy is going to be to answer all the wordy questions in the multiple choice first (at least 7 quick easy marks to get me going while brain still fresh) then do section A, then do the rest of the multiple choice!
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    (Original post by Sbarron)
    Great question!! I keep asking this and get different answers but a tutor said to me the other day that as long as it's the right way and right answer for your way it doesn't matter what you use in your calculations as technically the examiner should be going through your workings to see what you've done. Sf only really matter when writing your answers (mainly ones that ask for sf) and NOT in the calculations....
    Please someone correct me again if I'm wrong
    Yeah I need to get out of the habit of writing down a formula and an answer with no step inbetween I guess
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    Is anyone else thinking of doing a quickie MC right before the exam? It would have to be different to the ones on the AQA site because I know the answer to those already. Any unofficial MC's floating around?
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    (Original post by JJBinn)
    Yeah I need to get out of the habit of writing down a formula and an answer with no step inbetween I guess
    Well i think you should do in the writing section. In the multiple choice you don't have to which i tend to do them on my calculator


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    (Original post by NEWT0N)
    Is anyone else thinking of doing a quickie MC right before the exam? It would have to be different to the ones on the AQA site because I know the answer to those already. Any unofficial MC's floating around?
    I couldn't quite get you


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    (Original post by MSB47)
    Just to verify... when the force on the wire is downwards due to flemings left hand rule then would the scale reading decrease because of a reaction force and vice versa if the force is upwards? If so what would the reaction force be?

    Thanks for any help

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    The reaction force would be equal the the exerted force. Where did you get that paper?


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    Haha I just remembered the looks I got from the examiner last year when I almost dislocated my shoulder attempting the LHR
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    (Original post by Sbarron)
    Haha I just remembered the looks I got from the examiner last year when I almost dislocated my shoulder attempting the LHR
    Haha this year I'll be putting my thumbs up at her!!
 
 
 
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